Vishay Siliconix SI9183DT-30-T1-E3

Overview

SI9183DT-30-T1-E3 from Vishay Siliconix is a fixed-output 3.0-V, 150-mA CMOS low-dropout (LDO) voltage regulator in Thin SOT-23-5 package. It delivers 135-mV dropout at 150-mA load, supports 300-mA peak current, uses ceramic output capacitors, and features shutdown control and thermal/short-circuit protection. It is designed for battery-powered portable systems requiring stable, low-noise 3.0-V supply.

For engineers reviewing the SI9183DT-30-T1-E3 datasheet, SI9183DT-30-T1-E3 pinout, SI9183DT-30-T1-E3 application, or SI9183DT-30-T1-E3 equivalent, key selection criteria include guaranteed 3.0-V ±2.5% accuracy across −40°C to +85°C, 100-μV_rms output noise with 0.1-μF CBP capacitor, fast 30-mV load transient response, and 1-μA shutdown current - all critical for power-sensitive embedded designs.

Technical Context

The SI9183DT-30-T1-E3 implements a CMOS-based LDO architecture with internal 1.215-V reference and error amplifier, enabling ultra-low ground current (500 μA typical at 150 mA) and high PSRR (60 dB at 1 kHz). Its bandwidth exceeds 50 kHz, supporting rapid line/load transients without external compensation.

It integrates a 6-MΩ internal pull-down on the SD pin, defines ON/OFF thresholds at VIH ≥ 1.2 V and VIL ≤ 0.4 V, and maintains stability with 1–10 μF ceramic output capacitors (X5R/X7R), eliminating need for tantalum or electrolytic types.

Key Specifications

Pinout & Package

SI9183DT-30-T1-E3 is housed in a lead (Pb)-free Thin SOT-23-5 package (1.6 mm × 2.9 mm × 1.1 mm), optimized for space-constrained portable PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with MCP1700T-3002E/TT and XC6206P302MR-G, SI9183DT-30-T1-E3 uniquely combines ultra-low dropout (135 mV), integrated noise reduction (BP pin), and full protection set in a 5-pin SOT-23 - making it optimal for compact, battery-limited, noise-sensitive portable electronics where every millivolt and microamp matters.

Availability

SI9183DT-30-T1-E3 is available at Aetrix Electronics and suitable for cellular phones, PDAs, notebook peripherals, and wireless sensor nodes requiring stable component supply, long-term lifecycle support, and Pb-free compliance.

Supply support for SI9183DT-30-T1-E3 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay Siliconix is a global semiconductor manufacturer specializing in discrete components and analog ICs, with leadership in power management, sensing, and passive technologies.

The Si9183 family was engineered specifically for battery-powered portable electronics, emphasizing ultra-low dropout, minimal quiescent current, and fast transient response to maximize runtime and signal integrity.

FAQ

What is the guaranteed output voltage tolerance of SI9183DT-30-T1-E3 over temperature?

The SI9183DT-30-T1-E3 guarantees ±2.5% output voltage accuracy across the full operating ambient temperature range of −40°C to +85°C, as specified in the datasheet's "Output Voltage Accuracy (Fixed Versions)" parameter. This tolerance applies under 1–150 mA load conditions and ensures reliable 3.0-V operation for logic interfaces even in extreme environmental conditions. The SI9183DT-30-T1-E3 achieves this via an internal trimmed 1.215-V bandgap reference and precision feedback network.

Does SI9183DT-30-T1-E3 require an external capacitor on the BP pin for basic operation?

No, the SI9183DT-30-T1-E3 operates fully functional without a capacitor on the BP pin. The BP (bypass) pin is optional and used only to reduce output noise - connecting a 0.1-μF ceramic capacitor from BP to GND lowers RMS noise from 300 μV to 100 μV (50 Hz–100 kHz). For non-noise-critical applications like digital logic rails, omitting the BP capacitor is acceptable and simplifies the BOM. The SI9183DT-30-T1-E3 remains stable and within spec regardless.

What is the minimum input voltage required for SI9183DT-30-T1-E3 to maintain regulation at 150 mA load?

The SI9183DT-30-T1-E3 requires a minimum input voltage of 3.135 V to maintain 3.0-V regulation at 150 mA load, based on its guaranteed 180-mV maximum dropout voltage over temperature (−40°C to +85°C). At room temperature, typical dropout is 135 mV, so VIN ≥ 3.135 V ensures regulation across full temp/load conditions. Input below 3.135 V causes VOUT to droop proportionally - the SI9183DT-30-T1-E3 does not regulate below this threshold.

Can SI9183DT-30-T1-E3 drive a 10-μF ceramic output capacitor?

Yes, the SI9183DT-30-T1-E3 is explicitly characterized and guaranteed stable with output capacitors ranging from 1 μF to 10 μF, including X5R and X7R ceramic types. The datasheet confirms stability across this full range under all load conditions (0–150 mA), eliminating need for external compensation. Using 10 μF improves load transient response and reduces output impedance at higher frequencies - a valid design choice for systems with dynamic current demands. The SI9183DT-30-T1-E3's internal compensation is optimized for this capacitor range.

How does the shutdown function of SI9183DT-30-T1-E3 behave when the SD pin is left floating?

When the SD pin of SI9183DT-30-T1-E3 is left floating, its internal 6-MΩ pull-down resistor pulls the pin to GND, forcing the device into shutdown mode with ≤1 μA supply current. This fail-safe behavior prevents unintended activation and conserves battery power. To enable regulation, SD must be actively driven to ≥1.2 V (e.g., tied to VIN or a GPIO). The SI9183DT-30-T1-E3 datasheet specifies VIH(min) = 1.2 V and VIL(max) = 0.4 V, confirming robust noise margin for reliable control.